1. 產(chǎn)生飛墨的緣由
1. Reasons for Flying Ink
油墨轉(zhuǎn)移時(shí)，在兩個(gè)相接觸的墨輥處，纖維物在兩處或兩處以上，被切斷或拉長(zhǎng)時(shí)產(chǎn)生斷片，因外表張力成為球狀。此時(shí)，纖維物與斷片界面存在的雙電層被毀壞，一局部留存在油墨中，另一局部以相反的電荷逸向大氣。當(dāng)纖維物縮短時(shí)，油墨中殘留的電荷逐步堆在墨輥及紙張外表。斷片因帶有和油墨相同的電荷，靠近墨輥或紙張時(shí)，被排擠于空中構(gòu)成飛墨。
When ink transfers, at two or more contact rollers, the fibers are cut off or elongated to produce fragments, which become spherical due to external tension. At this time, the electric double layer existing at the interface between the fibre and the fragment is destroyed, one part is left in the ink, and the other part escapes to the atmosphere with opposite charges. When the fibre is shortened, the residual charges in the ink gradually pile up on the surface of the ink roll and paper. Fragments, with the same charge as ink, are squeezed into the air to form flying ink when they are near the ink roll or paper.
當(dāng)高速機(jī)用黏性大的油墨，低質(zhì)量的連結(jié)料時(shí)，易使油墨在墨輥旋轉(zhuǎn)中，拉生長(zhǎng)絲產(chǎn)生嚴(yán)重的飛墨現(xiàn)象，因而不同型號(hào)的印刷機(jī)需求選擇相應(yīng)的油墨來(lái)匹配。
When high-speed press uses high-viscosity ink and low-quality linking material, it is easy to make ink rotate in the ink roll, drawing filament produces serious flying ink phenomenon, so different types of printers need to choose the appropriate ink to match.
2. 影響飛墨的要素
2. Elements Affecting Flying Ink
(1)油墨黏渡過(guò)大，油墨在墨輥出口處被拉長(zhǎng)，易產(chǎn)生飛墨，同時(shí)還會(huì)構(gòu)成傳墨不勻，使紙張拔毛脫粉，紙張從橡皮布上剝離艱難，易花版、掉版等;黏渡過(guò)小，墨層團(tuán)結(jié)不佳，易產(chǎn)生飛墨，同時(shí)易使油墨乳化，起浮臟、糊版、網(wǎng)點(diǎn)擴(kuò)展，影響印刷產(chǎn)質(zhì)量量。
(1) Ink stickiness is too large, ink is elongated at the outlet of ink roll, which is easy to produce flying ink. At the same time, it will make the ink transfer uneven, making the paper dehairing and dedusting, paper peeling from rubber cloth difficult, easy to pattern, offset and so on; too small stickiness, poor ink layer unity, easy to produce flying ink, and easy to emulsify ink, float dirt, paste plate, dot expansion, affecting the quality of printing.
(2)墨輥上墨層愈厚，飛墨愈大。打樣在銅版紙上，墨層厚度在1.2μm時(shí)，版上油墨只需抵達(dá)2.8g/m2就行;但用膠版紙印刷，版上油墨少要抵達(dá)4g/m2。遇到紙張性能對(duì)油墨黏附力不好的狀況，易構(gòu)成墨輥堆墨，從而產(chǎn)生飛墨。
(2) The thicker the ink layer on the roller, the larger the flying ink. When the thickness of the ink layer is 1.2 micron, the printing ink only needs to reach 2.8 g/m2, but when printed on offset paper, the printing ink on offset paper should reach at least 4 g/m2. When the paper performance is not good for the adhesion of ink, it is easy to compose ink roller stacking, thus producing flying ink.
(3) 墨輥外表凹凸不平及外表干結(jié)龜裂時(shí)，局部油墨層加厚，墨霧量增大，易產(chǎn)生飛墨。
(3) When the outer surface of the ink roller is rough and cracked, the local ink layer becomes thicker and the amount of ink mist increases, which is easy to produce flying ink.
(4) 印刷速度增加，飛墨增大。
(4) The printing speed increases and the flying ink increases.
(5) 空氣相對(duì)濕度小，促進(jìn)飛墨產(chǎn)生;濕度增大時(shí)，電荷減少，飛墨質(zhì)變小。
(5) The relative humidity of air is small, which promotes the production of flying ink. When the humidity increases, the charge decreases and the quality of flying ink decreases.
(6) 假定油墨中潤(rùn)版液太多，構(gòu)成嚴(yán)重的W/O型乳化油墨，黏度急劇降落，墨絲變短，會(huì)產(chǎn)生嚴(yán)重的飛墨現(xiàn)象。同時(shí)，浸入油墨的潤(rùn)版液還會(huì)腐蝕金屬墨輥，在墨輥外表構(gòu)成親水層而排擠油墨，構(gòu)成金屬墨輥脫墨。
(6) It is assumed that too much embossing liquid in the ink constitutes a serious W/O emulsified ink, and the viscosity drops sharply and the ink filament becomes shorter, which will cause serious ink flying phenomenon. At the same time, the embossing solution immersed in the ink will corrode the metal ink roll, forming a hydrophilic layer on the surface of the ink roll and extruding the ink, forming a metal ink roll deinking.
(7) 高分子量油墨的連結(jié)料，在油墨團(tuán)結(jié)時(shí)容易拉生長(zhǎng)絲，產(chǎn)生飛墨。
(7) The binder of high molecular weight ink is easy to pull the growing filament and produce flying ink when the ink is united.
3. 如何消弭飛墨
3. How to eliminate flying ink
(1) 選用的耐醇類油墨，使其順應(yīng)高速印刷。
(1) Select high-quality alcohol-resistant ink to adapt to high-speed printing.
(2) 定期將膠輥拆下來(lái)徹底清洗，使墨輥墨層平均，傳墨性能進(jìn)步。
(2) Remove the cots regularly and thoroughly clean them, so that the ink layer of the roller is averaged and the ink transmission performance is improved.
(3) 酒精濃度控制在10%-15%之間，過(guò)低或過(guò)高都不適合。
(3) The concentration of alcohol should be controlled between 10% and 15%, too low or too high is not suitable.
(4) 水斗液用量不宜過(guò)大，否則構(gòu)成墨絲變短，不利印刷。
(4) The amount of bucket liquid should not be too large, otherwise the ink filament will become shorter, which is not conducive to printing.
(5) 在油墨中參與電解質(zhì)時(shí)，飛墨會(huì)減少，隨電解質(zhì)的參與，導(dǎo)電度增加，飛墨現(xiàn)象會(huì)完好消逝。
(5) When electrolyte is involved in ink, the flying ink will decrease. With the participation of electrolyte, the conductivity will increase, and the flying ink phenomenon will disappear intact.
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